﻿/*
   Copyright 2012 Dmitry Bratus

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
*/
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Flower.Workflow
{
    /// <summary>
    /// The workflow interface. 
    /// 
    /// A class must implement this interface to be recognized as a workflow.
    /// </summary>
    /// <typeparam name="TIn">Input message type.</typeparam>
    /// <typeparam name="TOut">Output message type.</typeparam>
    public interface IWorkflow<in TIn, out TOut> : IProcessDefinition
    {
        /// <summary>
        /// The initializer. Constructs the initial state of the workflow.
        /// </summary>
        /// <param name="context">
        /// The Flower initialization context. 
        /// It contains Flower services available for the initializer.
        /// </param>
        /// <param name="arg">The input message.</param>
        /// <returns>The output message.</returns>
        TOut Initialize(IInitializationContext context, TIn arg);
    }
}
